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[NASA] Curiosity Blog Sols 4804-4811: Kicking Off the Final Phase of Boxwork Exploration

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Curiosity Blog Sols 4804-4811: Kicking Off the Final Phase of Boxwork Exploration

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NASA’s Mars rover Curiosity acquired this image of the “Nevado Sajama 2” drill hole using its Mars Hand Lens Imager (MAHLI), located on the turret at the end of the rover’s robotic arm. Curiosity captured the image Feb. 9, 2026 — Sol 4803, or Martian day 4,803 of the Mars Science Laboratory mission — at 07:41:32 UTC.
NASA/JPL-Caltech/MSSS

Written by Abigail Fraeman, Curiosity Deputy Project Scientist

Earth planning date: Friday, Feb. 13, 2026

Curiosity spent this week at Gale crater completing the last few activities associated with the

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before kicking off our final phase of the boxwork exploration campaign. As we’ve explored the boxwork region, the science team has divided up our activities into four phases: 

  • Phase 1: First approach (sols 4534-4570 / May through June 2025) — This phase focused on making initial observations of the boxwork unit, which culminated in the team’s decision to drill at the
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    .
  • Phase 2: Establish regional context (sols 4571-4599 / June through July 2025) — During this time, we collected additional observations of the boxwork unit between the Altadena drill location and arrival at the “main” boxwork area. This included stopping at the
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    .
  • Phase 3: Exploration of the best expressed boxwork structures (sols 4600-4805 / July 2025 to February 2026) — This ******* was the heart of the boxwork campaign. During phase 3, we collected lots of observations of the most well-defined ridges and hollows within the boxwork unit, and we used what we learned to select locations where we wanted to drill a hollow and ridge. We selected targets named
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    and
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    respectively.
  • Phase 4: Our final look (sols 4805- ??? / February 2026 and beyond) — We’re kicking off this phase now, which will focus on some last measurements of ridges and hollows as well as an exploration of the contacts between the boxwork unit and adjacent geologic units to the east and south. Once this is completed, we’ll wrap up and continue our climb up Mount Sharp through the recently named “Valle Grande.”

Our first drive away from the Nevado Sajama drill took Curiosity northeast along one of the wide ridges. From near this spot, we have a good view of ridges and hollows to the east. We’re particularly interested in getting a better look of a hollow that, in orbital data, seems to have interesting-looking bedrock on its floor as well as a particularly narrow ridge that has many small ridges branching off it, which the team has dubbed “Los Flamencos.” These images will help us see if we want to drive to one or both features, and they will help us plan the exact places to drive next week. While we’re here, Curiosity will also collect lots of data on the bedrock in front of the rover, with APXS and MAHLI observations planned for targets named “Mollecita” and “Monte Cielo.” 

We got so much wonderful data from the drilling activities over the last few weeks, and it feels really good to be back on the Martian boxwork road again to begin this final phase of our boxwork unit campaign.

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NASA’s Curiosity rover at the base of Mount Sharp
NASA/JPL-Caltech/MSSS

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Feb 17, 2026

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